Tenga, a popular monk and volunteer teacher of village children, died after setting himself ablaze Sunday in Sichuan province's Ganzi Tibetan Autonomous Prefecture, said the International Campaign for Tibet (ICT), headquartered in Washington.
The group said he was the 151st Tibetan to self-immolate since 2009. Earlier this year, another Ganzi resident named Wangchuk Tseten also carried out a fatal self-immolation.
Authorities told AFP they knew nothing about the latest incident.
London-based campaign group Free Tibet cited a friend of Tenga's present at the scene as saying the monk shouted "we want freedom in Tibet" as he lit himself on fire.
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"He said that every Tibetan has a responsibility, and told me that wherever I went, I should not forget Tibet. I always remember him saying, proudly, I am Tibetan," said one of Tenga's relatives now living in exile in the US, according to the ICT.
Beijing says its troops "peacefully liberated" Tibet in 1951, but many Tibetans accuse the Communist central government of religious repression and eroding their culture.
Tibetan monks within China have reported a campaign of government intimidation targeting the family and friends of those who set themselves on fire.